1st Street Viaduct: Over Glendale Boulevard

Over Glendale Boulevard. The 1st Street Viaduct over Glendale Boulevard is a reinforced concrete bridge with a box girder design constructed between 1940 and 1942. Designed by the City of Los Angeles Bureau of Engineering, the viaduct has Moderne-style architectural features integrated with smooth surfaces that show the influence of International Style Modernism. The reinforced concrete bridge section is 562 feet long and the entire structure, including approach spans and abutments, is 974 feet long, making the viaduct one of the largest road-to-road grade separations in Los Angeles dating from before the freeway system. The 1st Street Viaduct over Glendale Boulevard has been determined eligible for listing in the National Register of Historic Places as part of the Caltrans Statewide Historic Bridge Inventory. In 2017, the viaduct was seismically retrofitted with reinforced foundations and steel jackets at column bases. The bridge deck was widened by 2.5 feet on each side. The retrofit and widening necessitated the removal of the viaduct's distinctive railings, light poles, abutment pylons, railing caps, and stepped walls. The railings and light poles were salvaged and reused to the extent possible and replaced in kind when necessary. The pylons, railing caps, and stepped walls were reconstructed to match the original Art Moderne design. . This historical marker is in Westlake in Los Angeles in Los Angeles County California